Cat Conversion Harnesses - MAWK INDUSTRIES: CAT CAT CONVERSION HARNESSES CAT BYPASS HARNESSES. CAT ADAPTERS . Cat Conversion Harnesses $775 to $875 for most trucks 10 feet long. These harnesses are used to replace mechanical engines with electronic engines. Each wire is colored coded with eleven colors to match the Caterpillar wiring schematic. caterpillar wiring harness products for sale | eBay OEM Caterpillar CAT Wiring Harness and Plugs. New wiring harness in OEM bag as pictured. $35. Free shipping. Guaranteed by Sat, Oct 19. See similar items. Watch. CATERPILLAR HARNESS A 2G-1033 CAT WIRING HARNESS, BRANCHED NEW. WIRING HARNESS, BRANCHED. CATERPILLAR HARNESS A. $75. $10 shipping.